fix(web): render custom HTML and Markdown content consistently (#5760)

* fix(markdown): render announcement markdown consistently

- support soft line breaks for announcement markdown without changing the default parser behavior.
- add explicit markdown element styles so lists, tables, code blocks, and quotes render correctly when typography styles are unavailable.
- apply the announcement markdown mode in both the popover and detail dialog for consistent display.

* refactor(markdown): simplify fallback markdown styles

- remove duplicate typography utility classes now covered by explicit markdown element fallbacks.
- keep the markdown renderer behavior unchanged while reducing class noise.
- modernize small helper expressions to satisfy targeted lint checks.

* fix(content): render custom HTML consistently

- add shared rich content rendering so custom HTML and Markdown use the same path across public pages and announcements.
- reuse common URL and HTML detection instead of duplicating content format checks per page.
- keep custom home content inside the standard public layout while preserving full-page iframe rendering for external URLs.

web/default/src/features/dashboard/components/overview/announcement-detail-dialog.tsx

@@ -17,8 +17,8 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
 For commercial licensing, please contact support@quantumnous.com
 */
 import { useTranslation } from 'react-i18next'
+import { RichContent } from '@/components/rich-content'
 import { formatDateTimeObject } from '@/lib/time'
-import { Markdown } from '@/components/ui/markdown'
 import { ScrollArea } from '@/components/ui/scroll-area'
 import { Dialog } from '@/components/dialog'
 
@@ -59,7 +59,7 @@ export function AnnouncementDetailModal({
           {announcement?.content && (
             <div>
               <h4 className='mb-2 font-medium'>{t('Content')}</h4>
-              <Markdown>{announcement.content}</Markdown>
+              <RichContent breaks content={announcement.content} />
             </div>
           )}
           {announcement?.extra && (
@@ -67,9 +67,11 @@ export function AnnouncementDetailModal({
               <h4 className='mb-2 font-medium'>
                 {t('Additional Information')}
               </h4>
-              <Markdown className='text-muted-foreground'>
-                {announcement.extra}
-              </Markdown>
+              <RichContent
+                breaks
+                content={announcement.extra}
+                className='text-muted-foreground'
+              />
             </div>
           )}
         </div>